Grinding mill



A. PUNTENEY.

GRINDING M-ILL.

APPucAioN FILED FEB. 2a. 1921.

.1 ,409,238. Patented Mar. 14, 1922.

2 SHEETS-SHEET l.

ARCHIBALD PUNTENEY, OF WATERLOO, IOWA.

GRINDING MILL.

Menges.

Application filed February 23, 1921.

To @ZZ whom t may concern.'

Be it known that I, ARCHIBALD PUNTENEY, a citizen ofthe United States of America, and resident of Vaterloo, Black Hawk County, iowa, have invented a new and useful Grinding Mill, of which the following is a specification.

The object of this invention is to provide an improved construction for grinding mills.

A. further object of this invention is to provide improved construction for grindinof mills particularly adapted r.for breaking and feeding coarse substances such as ear corn and possessing amplified capacity in respect of the size of the machine.

A further object of this invention is to provide means for substantially doubling the output of a mill without increasing the size thereof or that of the breaking and feeding devices.

fr further object of this invention is to Vprovide improved means for permitting grinding elements to yield for the passage between them of foreign substances such as stones, nails and the like without damage to the grinding elements.

A further object of this invention is to provide means for adjusting the grinding elements to produce lmeal of varying fineness.

A further object of this invention is to provide improved means for taking the wear of a driving shaft- A further object of this invention is to provide improved means for feeding substance to be ground through a series of pairs of grinding elements or buhrs.

A further object of this'invention is to provide improved means for disassembling and assembling the grinding elements or buhrs.

lith these and other objects in view, my invent-ion consists in the construction, arrangement and combination of elements hereinafter set forth, pointed out in. my claims and illustrated by the accompanying drawing, in which- Figure 1 is a side elevation ofthe complete machine. Figure 2 is a pla-n, partly in section, of the mill mechanism proper whereby the functions of breaking and feeding material to the buhrs and Vof grinding such material by the buhrs is effected, together with means for adjusting7 assembling and disassembling the buhrs. Figure 3 is a cross-section on the iudicatedline 3 3 of Figure 2,

Specification of Letters Patent.

Patented Mar. 14, 1922.

Serial No. 447,355.

on an enlarged scale. Figure 4 is a face view of one of the buhrs. Figure 5 is a section on an enlarged scale on the indicated line of Figure 2. Figure 6 is a detail section on'an enlarged scale showing the means yemployed to secure the buhrs in sets to .other elements. Figure 7 is a cross-section on the lindicated line 7 7 of VFigure f2.

Much of the machine herein illustrated and described is common and well known, such as a support, hopper, driving shaft, train of gearing and power pulley and a grinding set or buhrs, and t-he same is shown as a setting for the improvement claimed, which relates particularly to the use of successive sets of buhrs and means for assembling, disassembling and adjusting the same.

ln the construction of the machine as shown the numeral 10 designates a stand,

base or support and 1l a hopper mounted thereon and provided with an outlet or discharge spout 12 at one end. A shaft 13 is mounted for rotation in suitable bearings carried by the base 10 and extends through the central portion ofthe bottom of the hopper 11. The shaft 1?) is capable of a limited degree of longitudinal movement in its bearings and is rot-ated by means of a train ofl gearing 11i between said shaft and a prime mover, the prime mover in this instance being shown conventionally as a driving pulley 15. The end portion of the shaft 13 opposite to the train of gearing extends materially beyond and outside of the hopper 11 and is employed to operate a grinding device as hereinafter described. Within the lower portion of the hopper 11 the shaft 13 is pro vided with a plurality of sleeves 16, 17 1b and 19 clutched together and suitably keyed to the shaft for conjunctive rotation thereby. The sleeves 16, 17, 18, 19 are provided with spiral feeding fins or blades 20 and breaking lugs 21, respectively, extending radially from the peripheries thereof and adapted to engage, stir, break and feed substance to be ground, such as ear corn and grain, longitudinally of the bottom of the hopper. Sleeves such as are illustrated may be used selectively and interchangeably on the shaft 125 within the hopper and the construction thereof may be modified as desired for efficicnt treatment and feeding of the various kinds of substance to be ground. An arched cap 22 is removably and replaceably Inounted on the stand 1() above the outlet or discharge spout 12 and the grinding devices Y in the compass of the cap 22 and a ring plate 23 is mounted circumferentially of the shaftY 13 .and concentric therewith and is adapted to be secured to the end of the hopper or to the stand 10 and in non-rotatable relationV the buhr being adjacent to the outer face of the ring platefand the buhr, and ring plate being connected by bolts 25. A spider or driving plate 26 is mounted circumferentially ofthe shaft 13 and is formed with diametrically opposed peripheral lugs 27, 2S, T-shaped in cross-section, Which lugs extend Within an annular groove 29 formed in the cap 22 and in that portion of the hopper immediatelybelow the cap. Ring buhrs or grinding plates 30, 31 are mounted circum ferentially of the shaft 13 andV on opposite sides of the spider 26.V The ring buhrs 30, 31

are placed Withi their backs to the spider 26 and are secured thereto by bolts 32 (Figure 6). The face of the buhr 30 is opposed andfadjacent to the face of the buhr 24. A carrying ring 33 is mounted circumferentially of the shaft 13 and a ring buhr or grinding plate 34 is mounted between said carrying plate and the buhr31. The buhrV is mounted With its back adjacent to the rear face of the carrying plate 33 and said elements are secured togetherl by bolts 35 (Figure 6). The face of the buhr 34 is opf posed and adjacent to the face of the buhr 31.

A sleeve 36 is mounted rigidly on the shaft 13 adjacent to and in abutting relation with the sleeve 19. Spirally arranged fins or blades 37 are formed on the periphery of one end portion of the sleeve 36 and are adapted for rotation Within the central openings of the ring buhrs 24 and 30. The sleeve 36 also is formed with diametrically opposite splines 38, 39 on its .periphery and said splines engage loosely in key seats formed in the driving plate 26. The driving plate 26 is formed with diametrically opposed holes or notches 40, 41 ',(Figure 3) occupying quarters alternating With the key seats in said plate, which f holes'provide passage for substance to be `ground through said plate. A semispherical hub 42 is mounted rigidly on the shaft 13 in' abutting relation With the sleeve 36 and 'said hub 'engages a concaved seat in the central portion of the carrying plate 33. Thus is provision made -for 'oscillation of the carryingVV ring 33 on the convex surface of the hub 42. Y Y

The carrying ring 33 is formed'with a lug 43 adapted to engage a portion of the hopper and hold said ring against rotation. The buhrs 24 and 34 are stationary in respect-of rotation, being held by the ring plate 23 and carrying platek 33 respectively while the buhrs 30 and 31 are arranged for rotation relative thereto coincident with the rotation of the spider 26 to which they areV The buhrs 24, 30, 31 and 34 areY secured. identical in size and construction and the grinding face of one of them is shown con ventiona-lly in Figure 4. Each of the buhrs is formed with alternating grooves and ridges arranged on various lines obliquely to the radii of the buhr and the showing in Figure 4 is conventional in that no claim is made herein for the size, construction or form of the grinding faces. The spider 26 has a limited range of movement longitudinally of the shaft 13 because of its feathered relation with the Ahub 36 and the ball-bearing connection 'between the carryingplate 33 and the hub 42 provides for a limited range of oscillation of the varying plate and buhr 34. Thus provision is made for automatic movement of the spider and carrying plate longitudinally or of an oscillatory character to permit of the discharge of foreign substance such as nails and the like Without damage to the buhrs.

A cross-bar 44 is mounted removably and .replaceably on the stand or base 10 and extends across and outside of the cap'22 and said cross-barcarries a bearing 45 adapted to journal' one end portion of the shaft 13. A sleeve 46 is formed with a journal bearing in one end adapted to receive the outer end portion of the shaft 13 and is formed with a hole centrally of its outer end and in alinement `with the shaft 13 adapted to Vreceive a bolt 47 the head of the bolt being located within the sleeve.

A thrust bearing 48, composed of cone plates spaced apart by and contacting' with bearing balls, is mounted Within the sleeve' 46 and abuts the outer endof the shaft 13. Packing such as Babbitt metal 49` is mounted in the sleeve 46 between the head of the bolt 47 and the thrust bearing 48.'Y A yoke 50 is-mounted transversely of the shaft 13 Y and the bolt -47 Vextends loosely through a hole in the' center ofY said` yoke. The hub of the yoke`50 is formed with a cam face 51 and a lever v52 is` fulcrurned on the bolt 47 between said hub and the outer end of the. sleeve 46. The 'hub of the cam lever 52 abuts the outer end of the sleeve V46 with a plainface but the opposite face thereof is of cam `formation and coacts with the camVV face 51. An expansive Vcoil spring 53 is mounted looselyron the bolt 47 Y andan adjusting nut k54 is screwed on the outer end portion, of said bolt and engages said spring, It is lthe functionvof the spring 53 to move the shaft 13 outwardly and thetension of said spring isfadjusted manually through the nut 54. One end portion of the yoke. 5() is connected by arod 55 to one end portion of the cross-bar 44, there being-a flexible connection between the outer end of said rod and the yoke. The opposite end portion `of the yoke 50 is formed with a hole through which is mounted a bolt 56, .the inner end portion of said bolt being screwseated in one `end portion of the cross-bai' 44. An adjusting nut 57 is mounted on the outer end portion of the bolt 56 and an expansive coil spring 58 is interposed between said nut andthe adjacent end portion .of the yoke 50. The rod 55 and bolt 56 serve to limit oscillation of the cam lever 5.2 and support the same at rest at either limit of its movement. The sleeve 46 is .formed with a bracket 59 extending radially therefrom and said bracket is formed with a channel iu its outer end radially of the shaft 13. A. shifting arm 60 is mount-ed in the channel of the bracket 59 and is formed with a yoke 61 at one end adapted to enter a circumferential groove 62 in the shaft 13 and embrace said shaft loosely. The shifting arm 60 isformed with a longitudinal slot 63 adapted to receive the rod 55 loosely and also is formed with a longitudinal slot 64 adapted to receive a bolt 65, which bolt eX- tends through the bracket 59 and is employed to secure the shifting arm adjustably in the channel of said bracket. When the cam lever 52 is in the position shown in Figure 2 the shaft 13 is at its limit of movement to the left, being held in such position by the contacting cam faces reacting through the sleeve 4G and thrust bearing 4S upon the outer end of the shaft. In such position the hub 42, acting through the carrying plate 33, tends to hold the buhrs iu close relation to each other so as to reduce or grind the substance delivered to them to a minimum of fneness provided. When itis desired to separate the buhrs for idle operation or for coarse cracking of grain, the cam lever 52 is turned through an arc from the position shown to contact with the rod 55, whereupon the spring 53 acts by eX- pansion to move the bolt 47, sleeve 46, bracket 59 and shifting arm 60 outwardly and said shifting arm acts through its fork 61 to move the shaft 13 outwardly. Outward movement of the shaft results in a corresponding movement of the hub 42 and relaXes the pressure previously existing on the buhrs. The pitch of the contacting cam faces may be varied somewhat by adjustmeut of the nut 57 thus loosening if desired the compressing' strain on the buhrs. The shifting arm 60 may be detached from the shaft 13 by loosening the bolt 65 and moving said arm longitudinally in the channel of the bracket 59.

The various parts being in the positions shown, including the cap 22, material to .be ground is deposited in the hopper 11 and is fed, broken or cracked by the feeding devices in the bottom of the hopper, into the central holes in the buhrs 24 and 30 and also, in part, through the holes or notches `40, 4l. in the spider 26 to the holes in the center of the buhrs 31 and 34. The material passes radially into the spaces between thebuhrs and is ground by ythe serrated faces thereof` and discharged by gravity through the spout 12. The vfinene of grinding is adjusted through the nut 57. The spring 53 and nut 54 are utilized to adjust the closeness of relation of the buhrs or the compact-ness of the assembly olf-buhrs, dependent for final adjustment uponthe nut 57. The buhrs are thrown into and out of grinding relation by manipulation of the cam lever 52. Thus provision is made for utilizing twin sets of buhrs in close relation and succession in the path of travel of the material to be or being ground. The only enlargement of the machine is in respect of the discharge spout 12 and cap 22 which are sized to accommodate the twin sets of buhrs. Any suitable means may be employed auxiliary to the bolts 25, 32 and 35 to connect the respective buhrs to their carriers for the purpose of minimizing danger of shearing off said bolts.

The lugs 27, 28 on the spider or driving plate 26 serve to prevent ground grain from accumulating and clogging in the housing by scraping and fanning such grain as said driving plate revolves. This is an important function as the twin buhr devices grind so rapidly that otherwise the housing would clog up'and the grinding operation be caused to cease.

I claim as my invention- 1. In a grinding mill, the combination with a housing, a buhr assembly and means for driving elements thereof, of a carrying plate supporting one of lsaid buhrs and formed with a lug pivotally engaging said housing whereby said carrying plate is held against rotation, the driving means being provided with a hub having a convex surface adapted to engage a concave surface formed on the carrying plate, whereby the carrying plate and elements of the buhr assembly may oscillate.

2. In a grinding mill, the combination of a drive shaft mounted for rotation and also arranged for rectilinear reciprocation, a sleeve formed with a bearing for one end of said shaft and also formed with a bracket, the shaft being formed with a circumferential groove adjacent to said sleeve, a shifting arm adjustably mounted on said bracket and formed with a fork adapted to engage the shaft within said groove, means for preventing rotation of the sleeve, bracket and shifting arm, and means for moving the shaft, sleeve, bracket and shifting arm conjunctively longitudinally of the trend of the shaft.

3. In a grinding mill, the combination of a drive shaft mounted for rotation and also Y a'drive shaft mounted for rotation and also arranged for rectilinear reciprocation, a sleeve Ji'orxned with a bearing for one end ot said sba'lt and also 'i'ormed with abracket,

the shaft being formed with a rcircuniiyeren-z tial groove adjacent to said sleeve, a shifting arm mounted on said bracket vand formed with a fork adapted 4to engage the Ashaft within said groove, means for preventing rotation of' the sleeve, bracket and shifting arm, a yielding pressure device adapted to conjunctively inove said shaft, sleeve, bracket and shifting arm longitudinally of the axis of thesliait,V cam devices for putting said yielding pressure device under tension, and means for adjusting the pitch ofv said cani devices.

Signed at lVaterloo, in the county of Black Hawk and State of Iowa, this 31st lay of January, 1921.

ARCIHBALD PUNTEN 

